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以安徽琅琊山天然林内的三株树干具有１０°倾斜角的刺楸应拉木为材料，分应拉区（ 简称 Ｔ区） ，对应区（ 简称 Ｏ 区） 和侧区（ 简称 Ｓ 区） 来研究其应拉木纤维长度、微纤丝角和组织比量的径向变异和轴向变异规律．结果表明：刺楸应拉木三区纤维长度的径向变异为“先递增，后保持平稳”模式，微纤丝角度的径向变异模式为“先递减，后保持平稳”模式，但三区由递增或递减向平稳过渡的年限不同， Ｓ， Ｏ 区都为１７ 年左右， Ｔ 区为２２ 年左右；三区组织比量的径向变异和解剖特性的轴向变异模式都不尽相同．
In order to study the relationship between the zone of pull pull (referred to as zone T), the corresponding zone (zone O) and the side zone (zone S for short) with three tree branches of Langya mountain in Anhui Province with 10 ° tilt angle The radial variation and axial variation of fiber length, microfibril angle and tissue ratio were studied. The results showed that the radial variation of fiber length in the three regions of Catalpa bungei was “first increasing and then maintaining a steady” mode. The radial variation pattern of microfibril angle was in the mode of “decreasing firstly and then keeping stable” The years of transition from increasing or decreasing to stable are different. The S and O zones are about 17 years and the T zone is about 22 years. The radial variation of anatomical proportions and the axial variation patterns of anatomical characteristics in the three districts are all different.